That is true, help is often required with regular admin tasks, things like writing the monthly blog post, updating the monthly leagues, assigning prizes, moderating the Discord server, etc.
It depends on the community and how it is organised. openstudyroom.org (OSR) is friendly and generally well-organised. It uses channels for specific topics and there is an off-topic channel for everything else. There are audio channels for game reviews and voice chat. There is a system of roles that helps to mention specific groups of people (@player, @reviewer, @tsumegoer). There is a bot that helps people assign and remove these roles.
Discord as a tool can be really useful. Besides OSR I’ve been using it to give online Go classes, @climu has been using it for teaching, my IRL Go club also uses it for online meetings.